二氧化铀氧化过程中机械力-化学耦合的热力学研究
A thermodynamic approach of the mechano-chemical coupling during the oxidation of uranium dioxide
摘要：
本工作的目的是引入一个热力学模型来描述金属衬底上的氧化物层的生长。更确切地说，本文提供了一个研究的氧溶解成固体，其后果的机械应力的幻影。它们强烈影响氧化过程，并且在某些材料中可能导致开裂。为了实现这一研究，机械的考虑被引入到经典的扩散定律。模拟了二氧化铀的特殊情况，它经历了化学碎裂。根据我们的模拟，压缩应力场到氧化的UO 2化合物的内部界面附近的假设是一致的实验观察到的氧化机制的解释。
英文摘要：
The aim of the present work is to introduce a thermodynamic model to describe the growth of an oxide layer on a metallic substrate. More precisely, this paper offers a study of oxygen dissolution into a solid, and its consequences on the apparition of mechanical stresses. They strongly influence the oxidation processes and may be, in some materials, responsible for cracking. To realize this study, mechanical considerations are introduced into the classical diffusion laws. Simulations were made for the particular case of uranium dioxide, which undergoes the chemical fragmentation. According to our simulations, the hypothesis of a compression stress field into the oxidised UO2 compound near the internal interface is consistent with the interpretation of the mechanisms of oxidation observed experimentally.
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